Delete unnecessary file system API usages. (#12320)

Author: leojaygoogle

FirebaseMessaging/Sources/FIRMessagingSyncMessageManager.m

@@ -24,8 +24,6 @@
 #import "FirebaseMessaging/Sources/FIRMessagingUtilities.h"
 
 static const int64_t kDefaultSyncMessageTTL = 4 * 7 * 24 * 60 * 60;  // 4 weeks
-// 4 MB of free space is required to persist Sync messages
-static const uint64_t kMinFreeDiskSpaceInMB = 1;
 
 @interface FIRMessagingSyncMessageManager ()
 
@@ -63,12 +61,6 @@ - (BOOL)didReceiveAPNSSyncMessage:(NSDictionary *)message {
       [self.rmqManager querySyncMessageWithRmqID:rmqID];
 
   if (!persistentMessage) {
-    // Do not persist the new message if we don't have enough disk space
-    uint64_t freeDiskSpace = FIRMessagingGetFreeDiskSpaceInMB();
-    if (freeDiskSpace < kMinFreeDiskSpaceInMB) {
-      return NO;
-    }
-
     int64_t expirationTime = [[self class] expirationTimeForSyncMessage:message];
     [self.rmqManager saveSyncMessageWithRmqID:rmqID expirationTime:expirationTime];
     return NO;

FirebaseMessaging/Sources/FIRMessagingUtilities.h

@@ -34,7 +34,6 @@ FOUNDATION_EXPORT BOOL FIRMessagingIsWatchKitExtension(void);
 
 #pragma mark - Others
 
-FOUNDATION_EXPORT uint64_t FIRMessagingGetFreeDiskSpaceInMB(void);
 FOUNDATION_EXPORT NSSearchPathDirectory FIRMessagingSupportedDirectory(void);
 
 #pragma mark - Device Info

FirebaseMessaging/Sources/FIRMessagingUtilities.m

@@ -21,7 +21,6 @@
 #import "FirebaseCore/Extension/FirebaseCoreInternal.h"
 #import "FirebaseMessaging/Sources/FIRMessagingLogger.h"
 
-static const uint64_t kBytesToMegabytesDivisor = 1024 * 1024LL;
 NSString *const kFIRMessagingInstanceIDUserDefaultsKeyLocale =
     @"com.firebase.instanceid.user_defaults.locale";  // locale key stored in GULUserDefaults
 static NSString *const kFIRMessagingAPNSSandboxPrefix = @"s_";
@@ -114,28 +113,6 @@ BOOL FIRMessagingIsWatchKitExtension(void) {
 #endif
 }
 
-uint64_t FIRMessagingGetFreeDiskSpaceInMB(void) {
-  NSError *error;
-  NSArray *paths =
-      NSSearchPathForDirectoriesInDomains(FIRMessagingSupportedDirectory(), NSUserDomainMask, YES);
-
-  NSDictionary *attributesMap =
-      [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject]
-                                                              error:&error];
-  if (attributesMap) {
-    uint64_t totalSizeInBytes __unused = [attributesMap[NSFileSystemSize] longLongValue];
-    uint64_t freeSizeInBytes = [attributesMap[NSFileSystemFreeSize] longLongValue];
-    FIRMessagingLoggerDebug(
-        kFIRMessagingMessageCodeUtilities001, @"Device has capacity %llu MB with %llu MB free.",
-        totalSizeInBytes / kBytesToMegabytesDivisor, freeSizeInBytes / kBytesToMegabytesDivisor);
-    return ((double)freeSizeInBytes) / kBytesToMegabytesDivisor;
-  } else {
-    FIRMessagingLoggerError(kFIRMessagingMessageCodeUtilities002,
-                            @"Error in retreiving device's free memory %@", error);
-    return 0;
-  }
-}
-
 NSSearchPathDirectory FIRMessagingSupportedDirectory(void) {
 #if TARGET_OS_TV
   return NSCachesDirectory;